Requirement is to make the PROMISED DATE field as same as that of NEED BY DATE field through Forms

I did try this options but didn’t work out.

 

Steps:

 

1) Create and Approve the Purchase order.

2) Go to Tools and select acceptence form and enable the checkbox for the Accepted field and click on OK Button.

 

When Acceptance check box is enabled then,

The PROMISED value of the po line would automatically should get populated same as that of  NEED-By Date Field value if it is NOT NULL and this needs to be done for all lines in PO

 

Here what is done so far:

 

CONDITION: Trigger Event: WHEN-VALIDATE-RECORD

Trigger Object: PO_LINES

 

CONDITION: :PO_LINES.po_header_id in